Physics (AS & A Level) · May / June 2017 · Paper 12 · Question 34

Two wires have the same length and the same resistance. Wire X is made of a metal of resistivity 1.7 × 10⁻⁸ Ω m and wire Y is made of a metal of resistivity 5.6 × 10⁻⁸ Ω m. The diameter of wire X is 0.315 mm. What is the diameter of wire Y?

1. A0.17 mm
2. B0.33 mm
3. C0.57 mm
4. D1.0 mm

As printed in the paper